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Chapter 422: The party’s uninvited gues
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... ding pigs? Or maybe just pour it away?”
“It also has another use. Some people collect the swill and the oil slick from the grease traps in the drainage systems and boil them in a huge pan. And so, they are able to refine and produce new oil...”
Xu Tingsheng basically narrated the process of how gutter oil was refined.
Lu Zhixin’s brows were tightly furrowed as she asked, “What would such dirty oil be used for?”
“After a bit of work, it can be sold to some small ea ...
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